Tension-limit for springs.



L. S. CUNNY TENSION LIMIT FOR SPRINGS. APPLICATION FILED Main. 1914.

'1 ,208,298. Patented Dec. 12,1916.

, the calaxles to it pulls UNITED STATES PATENT OFFICE.

LDUIS S. SUNNY, Ol? NIAGARA FALLS, NEW YORK, ASSIGNOR, BY MESN'E ASSIGNMENTS, TE) '0'. l3. LIGBI'D'AIH) HEAT CORFDRATION, OF NIAGARA FALLS, NEW YORK, A COR PORATIQN OF NEW' YGBE.

TENSION-LIMIT FOE. SPRINGS.

muss-us.

Specification of Letters .E'atent.

Patented. Dec. 12, 1916.

Applizustlon file-cl April 17, 191%. Serial No. 8 3239% To 0.55 whom it may oonoern:

it known that I, LOUIS S. Gunny, u citizen of the United States, residing at Niagara F slls, in the county of Niagara and. State of New York, have invented new and useful Improvements in Tension-Limits for Springs, of which the following is s, full, clear, concise, ancl exact description, reference bein bad to the accompanying drawing, forming a pert of this specification.

My invention relates to tension limits for springs.

Car lighting generators are usually driven by 2. bolt running from a pulley on one of on the generator armature shaft. In or or tomsintsin the proper tension on the belt, it is customary to provide someform of tension d'ovice which normally tends to force the generator away from the driving axle. Such devices, in many instances, include a tension rod pass ing through a relativel fixed support and attached at one end, cit or to the generator or to some portion of the frame w 'ch 511 n ports the generator. The other end. or too rotl is provided with an adjustable nut, whereby the spring carried by said rod, is confineci bet-Ween said fixed support end nut, thereby tending to thmisb said rod o. direlation to place the driving belt under tension.

An object of my invention is to provide means whereby the tension. applied to the clriving belt ofs generator can be definitely limited to e predetermined. amount.

Another obj ect of. my invention is to provide means whereby the tension applied to the belt tensioning.springs 016 agenerator suspension can be accurately limited to a predetermined amount.-

Otber objects of my invention will hereinafter appear.

"In order that my invention may be clearly disclosed I have illustrated one embodiment thereof in. the accompanying drswings, in whiehi Figure 1 is an elevation of one form of generator suspension illustrating the relation of the tension limiting device to the other parts of the apparatus. Fig. 2 is an enlarged section of the tension hunt and adjscent parts.

The generator suspension selected for the purpose of illustrating the use of the tension """limit, compr a P Of Subsmmiany anal-suspension bars 1, which project beyond the end of a car truck, not shown. The outer ends 2 of these bars are bent downwardly, as shown in Fig. 1, and have their extremities 3 twisted in-a. plane at right angles to the plane of the bars. Sliclably supported by the suspension bars are a pair of U shaped slings 4:, upon which a car lighting generator 5, is mounted. The enorator is driven from the car axle by a be t 6. At- 66 tacked, to one of the slings is aoension rod 7. This rod exuends through the opening 8 in the twisted extremity of tbe'suspension bar andis rovided with a threaded portion of sufiicient length to extend for a, considerable 70 distance on either side of the opening 8. The rod is normally forced away from the generator by the spring 9, held between the nut 10 and the bushing 11. The spring 9 overns the tension on the driving belt, 6. 76

he tension on the spring 9 is regulated by adjustin the nut 10 along the tension rod.

In or or to limit the amount of tension that can be applied to the dtivi belt by the spring 9, a sleeve 12 is fitte on the S0 tension rod between the nut 10 and the adjustable nut 13 carried b the tension .rod on the opposite side of t e extremity 3 of the suspension bar from the nut 10. The

sleeve fits within the spring and the bushing l5 l1, and is of such a. length that when the nuts 10 and 13 are adjusted so as to abut against its ends, the spring will have its maximum tension, that 13, the properamount of tension to be applied to he drivin belt. By this means the tension on the be t may be accurately limited to a predetermined amount, thereby increasing the efliciency of the apparatus.

When, during inspection, it is desirable to operate the generator as. a motor from the storage batteries, the driving belt may be slackened by turning the adjusting nuts 10 and 13 in a direction to force the gem orator toward the car axle.

The embodiment of an invention described herein has been so ected merely for the purpose of illustration.

My invention covers another means for accomplishing the desired result so long as such. means fall within the scope of the appended claims.

Obviously the invention may be *apphed to other types of suspension than the one specifically illustrated and described herein and is not limited to a suspension directly applied to a car truck.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In combination, a movably mounted generator, a belt for driving said generator, means for placing said belt under tension, and means for limiting the amount of tension that can be applied to said belt.

2. In a generator suspension, a tension rod, a relatively fixed support therefor, a spring carried by said rod n'ieans for placing said spring under tension, and means for limiting the amount of tension that ran be applied to said spring.

ll, ln :1. generator suspension, a tension rod, :1. spring carried thereby, means for placing said spring under tension, and means for limiting the amount of tension that can be applied to said spring.

4, In a generator suspension, a tensioning member, a relatively fixed support therefor,

a spring carried by said member, and a sleeve for limiting the amount of tension that can be applied to said spring.

5. A generator suspvnsion for an axle driven generator imrfuding a movably mounted frame for supporting the generator on the car, a relatively fixed member in proximity thereto, a tension member connected to said movable frame, an adjustable spring confined between said relatively fixed member and an adjustable portion of said tension member, an abutment on said tension member, and a rigid member adjacent said tension member and confined between said abutment and said adjustable portion to limit the amount of tension which may be applied to said spring.

In Witness whereof, I have hereunto sub scribed my name in the presence of two \"il nesses.

LOUIS S. CUNNY.

Witnesses:

WM. A. Fnoeaynn, ERNST BAUER. 

